San Diego Foundation, Stem Wall & Slab Removal Cost Calculator
- Upfront 2026 San Diego Math: Live rates for ADU / room slab, bungalow slab & ranch home slab scopes.
- Pad Backfill & Rough Grade: Transparent pricing for footing trench backfill & laser rough pad grading & dust suppression.
- Footing Depth & Rebar & Add-Ons: Itemized footing depth & rebar plus retaining walls & flatwork.
- DSD Permit & 811 Check: Turnkey San Diego permit routing, DigAlert 811 & 65%+ C&D diversion.
Foundation & Slab Removal Calculator
How to Calculate San Diego Foundation, Stem Wall & Monolithic Slab Removal Cost Step-by-Step
Step 1: Base Foundation & Slab Removal Rate & San Diego Haul Index
Start by selecting a preset or entering your exact slab area in sq ft. Across San Diego County, excavator hydraulic hammer slab & stem breaking averages $5.15/sq ft (with a $3,200 minimum crew & equipment mobilization floor) adjusted by the 1.14x San Diego haul & transfer index.
Base Cost = Round(Max(Sq Ft × $5.15 × Access Multiplier, $3,200) × 1.14)
Step 2: Foundation System Type Multipliers
- 4″-5″ Slab on Grade (1.0x): Applied based on site staging, structural complexity, and San Diego equipment access.
- Deep Stem + Piers (1.25x): Applied based on site staging, structural complexity, and San Diego equipment access.
- Post-Tension Slab (1.40x): Applied based on site staging, structural complexity, and San Diego equipment access.
Step 3: Footing Depth & Rebar
Controlled post-tension de-tensioning & deep footing extraction. Select between 12″-18″ Footing ($0), 24″-36″ Footing (+$1.65/sf), Grade Beam/Piers (+$3.10/sf) so your estimate reflects exact subsurface and finish-grade conditions.
Step 4: Pad Backfill & Rough Grade & Retaining Walls & Flatwork
San Diego compliance and dust/site controls (leaves clean native soil ready for new foundation trenching) include options for Trench Backfill (+$695), 90% Engineered Pad (+$1,695), Leave Excavated ($0). Bundling adjacent work during the same mobilization (Foundation Only ($0), Driveway / Porch (+$1,250), CMU Retaining Wall (+$2,350), Under-Slab Pipe Out (+$3,100)) eliminates paying a second transport fee.
Step 5: DSD Permit & 811 Check & Miramar C&D Diversion Credit
Permit and utility safety options include DSD + Sewer Plug (+$545), 811 + Build Permit (+$295), GC Handled ($0). Source-separating clean concrete aggregate, metals, and green waste for Miramar Greenery & San Diego C&D recyclers (65%+ CALGreen diversion) earns an automatic -$300 to -$1,250 credit ($0.45/sq ft).
Real-World Example: 1,650 Sq Ft Foundation & Slab Removal Project in La Jolla, San Diego
| Step | San Diego Scope Item | Math Calculation | Estimated Amount |
|---|---|---|---|
| Step 1 & 2 | Excavator Hydraulic Hammer Slab & Stem Breaking (1,650 sq ft) | 1,650 × $5.15 × 1 × 1.14 | $9,687 |
| Step 3 | Deep Seismic Footing, Grade Beam or Cable Cut | 12″-18″ Footing ($0) | $0 |
| Step 4a | Footing Trench Backfill & Laser Rough Pad Grading | Trench Backfill | +$695 |
| Step 4b | Bundled Porch, Driveway or Retaining Wall Removal | Driveway / Porch | +$1,250 |
| Step 5a | San Diego DSD Foundation Demo & Sewer Cap Check | DSD + Sewer Plug | +$545 |
| Step 5b | Miramar C&D Clean Concrete & Rebar Steel Rebate | Clamp(1,650 × -$0.45, -$300..$1,250) | -$743 |
| TOTAL ESTIMATED SAN DIEGO TURNKEY COST | $11,434 ($6.93/sq ft) | ||
| TYPICAL CONTRACTOR QUOTE RANGE (0.90x – 1.12x) | $10,291 – $12,806 | ||
Ready for a Fixed-Price On-Site San Diego Foundation & Slab Removal Bid?
- Licensed & Insured C-21 Crew
- SDAPCD Rule 1206 Compliant
- 65%+ Miramar C&D Recycling
- Free San Diego Site Visit
San Diego Foundation, Stem Wall & Monolithic Slab Removal Cost FAQs
1. How much does foundation, stem wall & monolithic slab removal cost in San Diego in 2026?
In San Diego County, turnkey foundation, stem wall & monolithic slab removal averages $10,291 to $12,806 for a standard 1,650 sq ft scope (or roughly $5.41 to $8.66+ per sq ft, subject to a $3,200 minimum mobilization floor). Final pricing depends on foundation system type, footing depth & rebar, and permit/testing selections.
2. What San Diego permits or environmental clearances apply to foundation & slab removal?
Depending on jurisdiction and scope, projects coordinate through City of San Diego Development Services (DSD, 1222 First Ave), County PDS, or local city counters, alongside mandatory USA DigAlert 811 underground marking and Pad Backfill & Rough Grade (leaves clean native soil ready for new foundation trenching).
3. How long does active on-site work take once permits and utilities are cleared?
Once utility safe-offs and required notices are complete, active Class C-21 field execution for a typical 1,650 sq ft project in La Jolla or Point Loma generally finishes in 1 to 4 working days, including haul-off, magnetic nail/debris sweep, and finish grade check.
4. How do you protect adjacent structures, driveways, and neighbor lots in San Diego?
We lay heavy HDPE turf and curb protection mats, perform precision wet diamond relief saw-cutting before mechanical breaking, run continuous atomized water or HEPA dust suppression, and carry full commercial general liability and workers’ compensation coverage.
5. How does San Diego's 65%+ C&D recycling credit lower my total cost?
San Diego C&D ordinances and California CALGreen Title 24 require 65%+ material diversion. By source-separating clean concrete rubble, steel/rebar, and green waste for Miramar Greenery and certified San Diego recyclers, we avoid mixed-landfill penalties and pass a -$300 to -$1,250 credit directly onto your estimate.